Camera 

Specifies how many motion blur steps to use for the camera. It makes sense to increase this value for cameras that are moving rapidly and following a non- linear path.

Transformation

Specifies how many motion blur steps to use for transformation motion blur. It makes sense to increase this value for rapidly rotating objects such as a car’s wheel.

Deformation

Specifies how many motion blur steps to use for deforming objects. Unless an object has an extreme deformation movement, this value should be set to 1. Having more deformation steps is more expensive (in terms of memory usage) than having more transformation steps since this implies geometry duplication inside the renderer.

Shutter Efficiency

Controls the speed at which the camera shutter opens and closes . A value of 0.5 simulates a shutter opening and closing slowly (this gives less weight to time samples at both ends of the sampling window, like a triangle filter), while a value of 1.0 simulates a shutter opening and closing instantly (this gives equal weight to all time samples, like a box filter), giving a less defined look.

Shading Frequency

Specifies how often a geometry is shaded when rendering with more than two motion blur samples. This property is only active when using the REYES rendering method for primary rays (see Quality). The shading frequency can be set on a per-object basis as described in Motion Blur Properties. Additionally, it is wiser to use the path-tracer for primary rays when very accurate motion-blur shading is required.


 

Shading FrequencyDescription
Once per frame Shades the geometry once every frame. This is the default and is the fastest alternative.
Once per segmentShades the geometry once every motion segment. This is the most accurate method in REYES. A textbook scenario where one has to use this method is a fast turning wheel: many motion segments are needed to preserve the circular shape of the wheel and shading per segment is needed so that specular highlights and reflections are pictured accurately.
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